Sad to say, his calculation sounds the most accurate, compared to my meter results.
I'm not even saying what my last A1C was -- I completely revamped my diet at the end of December and I'm waiting a solid 4 months before I subject myself to another HbA1C test.
I want shiny, fresh, clean and new red blood cells for my first test of 2012. Ha!
Isn't "multiply x 18" just to convert mmol/L to mg/dl? I've never heard it in reference to A1c (aside from people who think mmol/L is the same as A1c because they both cover a similar range).
Think you might be right. I knew it was to convert mmol to mg/dl and somehow just assumed it would covert to A1C.
Learnt something new! Thanks!
Ha, no problem. I do like the average it comes out with better! :)
I'm thinking that the A1C is measured in mmol. Here in Canada we only use the metric system and mmol is how we measure our blood sugar. Much easier to undstand 7.2 to 4.2 mmol is the "good" range.
Haha thanks everyone! Didn't think this post would get so much feedback.
I hope I live long enough to see A1Cs as low as all yours!!
Jenny Rhul has an A1c and Average Blood Glucose converter on her site, here.
The conversion factor for mmol/L and mg/dl is 18.02.
The formula for A1c and the Average Blood Glucose (ABG) conversion is:
ABG in mmol/L = 1.533 x A1c - 2.52
This is the 2007 ADAG formula derived from CGMs data.
Every tenth of a percent is meaningful. Bernstein gives a rule of thumb, every 1% reduction in A1c reflects a drop in average blood sugar of 40 mg/dl. Thus every tenth of a percent is 4 mg/dl. That is meaningful.
I hope you don't compare yourself to others, this is your personal journey. Every step forward means something and we hope to celebrate those with you. But we sometimes take a step forward, only to take another backward. But over time, with persistence, we will continue to move forward and it will make a difference as those forward steps add up.
I compare myself to people w/ pancreases!
I think there's enough variations in A1C tests that such a calculation borders on meaningless.
My first ever endo (pediatric) always had my blood drawn in the same lab because he'd seen inconsistencies from one to another. My previous endo did the test in his office using a fingerstick and some noisy machine that gave a result in 15 minutes; then he also had it measured at a lab with my other bloodwork.
Overall, I think the fingerstick A1Cs give a result that is about .2 or .3 lower than the lab results. I can't really comment on the deviations from one lab to the next (or even multiple tests on the same blood sample at the same lab), but I belive there's enough variation in A1C measurements that you can't go with a strict mathematical equation that maps A1C to average BG. But the best thing, I believe, is to have A1Cs tested from the same place so you can chart progress over time.
Agreed, in the sense that comparing your own A1c to the chart or anybody elses has to be taken with a grain of salt. Just the fact that you are comparing human beings means that there is going to be considerable variation from person to person in the relationship between A1c and avg BG.
I gave up trying to make the comparisons based on those charts match what I'm seeing personally for my own A1c to BG comparisons. Testing practically 24 hours day and comparing CGM numbers tells me that my own average BG, worse case scenario, is at least 10 points lower than what my A1c would indicate based on charts.
I still find the knowing my A1c from month to month meaningful, and I still shoot for normal BGs and an A1c in the normal range, but whether that A1c is 4.8 or 5.8 is only meaningful for myself and, alone, doesn't tell me much about my control.